PAM8019 datasheet(10/12 Pages) DIODES

10 / 12 page

PAM8019

Document number: DS38822 Rev. 1 - 2

10 of 12

www.diodes.com

May 2016

PAM8019

Application Information (Cont.)

Input Capacitor (CI)

It is desirable to use a large input capacitor but in applications where the speaker lacks the ability to reproduce signals below 100Hz to 150Hz it

may be possible to minimize CI without effecting system performance. Input Capacitor (CI) and Input Resistance (RI) of the amplifier form a high-

pass filter with the corner frequency determined equation below:

Fc = 1/ 2πRI x CI

In addition to system cost and size, click and pop performance is affected by the size of the coupling capacitors. A larger in/out coupling capacitor

requires more charge to reach its quiescent DC voltage (Normally 1/2 VDD). This charge comes from the internal circuit via the feedback and is

more likely to create pops upon device enable. Minimizing the capacitor size based on necessary low frequency response can minimize the turn on

pop.

Bypass Capacitor (CBYP)

Bypass Capacitor (CBYP) is the most critical capacitor and serves several important functions. During start-up or recovery from shutdown mode,

CBYP determines the rate at which the amplifier starts up. The second function is to reduce noise produced by the power supply caused by coupling

into the output signal. The noise is from the internal analog reference to the amplifier, which appears as degraded PSRR and THD+N.

A ceramic bypass capacitor (CBYP) of 0.47µF to 1.0µF is recommended for the best THD and noise performance. Increasing the bypass capacitor

reduces clicking and popping noise from power on/off and when entering and leaving shutdown.

Ordering Information

PAM8019 X X – X

Pin Configuration

Package

Product Name

G: 20

R : Tape & Reel

Packing

K:QFN4x4

Part Number

Package

Standard Package

PAM8019KGR

U-QFN4040-20

3000 / Tape and Reel

Marking Information

P8019

XXXYW

Y: Year

W: Week

X: Internal Code

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